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IOAN
Muscles of the shoulder Girdle
| muscle | origin | insertion | action | innervation |
|---|---|---|---|---|
| upper Trapezius | occipital bone and nuchal ligament on upper cervical spinous process | outer third of the clavicle and acromion process | scapular elevation and upward rotation | Spinal accessory (cranial nerve xi) |
| middle Trapezius | Spinous Processes of C7 through T3 | Scapular Spine | Scapular retraction | Spinal Accessory (cranial nerve XI) |
| Lower Trapezius | Spinous Processes of middle and lower thoracic vertebrae | base of the scapular spine | Scapular depression and upward rotation. | Spinal Accessory (cranial nerve XI) |
| Levator Scapula | Transverse Processes of C1-C4 | Vertebral Border of Scapula between the superior angle of the spine | Scapular elevation and Downward rotation | Third and Fourth Cervical Nerves and Dorsal scapular nerve |
| Pectoralis Minor | Anterior Surface, Third through fifth Ribs. | Coracoid Process of the Scapula | Scapular Depression, Protraction (moving shoulders forward and backwards) Downward rotation, and Tilt. | Medial Pectoral nerve |
| Rhomboids | Spinous processes of C7through T5 | Vertebral border of scapula between the spine and inferior angle | Scapular retraction, elevation ,and downward rotation | Dorsal scapular nerve |
| Serratus Anterior | Lateral surface of the upper eight ribs | Vertebral border of the scapula, anterior surface | scapular Protraction and upward rotation | long thoracic nerve |